It does seem a bit random to me sometimes, but that’s probably because I can’t see the landing point, and don’t look at my descent rate at the time of touchdown, so there’s no way for me to verify that it’s not accurate. If you ask one of the people in the top 100 they would disagree with you. When I finally completed a near perfect landing in a 747 I knew it was good and scored 1.6m, so I don’t agree overall. It can’t be accurate some of the time and random at other times, it either works or it doesn’t.
I agree though, it would be great to see a side and top view showing the landing lines taken, so we can access the descent rate, landing position, and roll lines.